I upgraded from 2.65.0+ 170502 to 3.7.1+ 180424.
All sees to be succesful, still testing but I have pickedup the following issues in the theme editor.

I extend the bootswatch theme and when I try open the Navigation Screen to edit it, I get the following error
file_get_contents(E:\WebSites\limesurvey\upload\themes\survey\Lonmin_New\views\): failed to open stream: No such file or directory



E:\WebSites\limesurvey\application\core\LSETwigViewRenderer.php(136)

124 * This method is called from Template Editor.
125 * It returns the HTML string needed for the tmp file using the template twig file.
126 * @param string $sView the view (layout) to render
127 * @param array $aDatas the datas needed for the view rendering
128 * @param Template $oEditedTemplate the template to use
129 *
130 * @return string the generated html
131 */
132 public function renderTemplateForTemplateEditor($sView, $aDatas, $oEditedTemplate)
133 {
134 $oTemplate = $this->getTemplateForView($sView, $oEditedTemplate);
135 if ($oTemplate) {
136 $line = file_get_contents($oTemplate->viewPath.$sView);
137 $result = $this->convertTwigToHtml($line, $aDatas, $oEditedTemplate);
138 return $result;
139 } else {
140 trigger_error("Can't find a theme for view: ".$sView, E_USER_ERROR);
141 }
142 }
143
144 /**
145 * Render the option page of a template for the admin interface
146 * @param Template $oTemplate the template where the custom option page should be looked for
147 * @param array $renderArray Array that will be passed to the options.twig as variables.
148 * @return string

Any idea how to fix this?